package com.zhongshengnetwork.rightbe.common;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import com.bumptech.glide.util.Util;

import java.nio.ByteBuffer;
import java.security.MessageDigest;

/**
 * Created by GordonLjx on 2016/9/19.
 */
public class CircleTransform extends BitmapTransformation {

    private final float radius = 0;

    private final String ID = "com.bumptech.glide.transformations.FillSpace";

    private final byte[]ID_BYTES = ID.getBytes(CHARSET);

    public CircleTransform(Context context) {
        super();
    }

    @Override protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        return circleCrop(pool, toTransform);
    }

    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null) return null;

        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;

        // TODO this could be acquired from the pool too
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);

        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);
        return result;
    }

    //以下三个方法解决刷新时图片闪烁问题
    @Override
    public boolean equals(@Nullable Object obj) {
        if(obj instanceof  CircleTransform){
            CircleTransform other = (CircleTransform)obj;
            return radius == other.radius;
        }
        return false;
    }

    @Override
    public int hashCode() {
        //避免Transformation重复设置,导致图片闪烁,同一个圆角值的Transformation视为同一个对象
        return Util.hashCode(ID.hashCode(), Util.hashCode(radius));
    }

    @Override
    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
         messageDigest.update(ID_BYTES);
         byte[] radiusData = ByteBuffer.allocate(4).putInt((int)radius).array();
         messageDigest.update(radiusData);
    }

}
